Directions : In the following questions, some parts of the sentences have errors and some have none, Find out which part of a sentence has an error. The number of that part is your answer. If there is no error then your answer is d:i.e. No error.
Air pollution, together with littering./are causing many problems/in our cities./No error
The Error is in part B.
Replace `Are' with `is'.
If the Subject is followed by words such as `together with,as well as,along with ' ,then the singular verb will follow singular Subject.
Air pollution & littering is followed by `together with' so it will take singular verb `Is'.
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